arthur washburn



UNITED STATES PATENT Crrtcn.

G. ARTHUR WASHBURN, OF PLAINVILLE, CONNECTICUT, ASSIGNOR OF ONE-HALF TO ORRIN A. BASSETT, OF SAME PLACE.

SNAP-HOOK.

SPECIFICATION forming part of Letters Patent No. 308,219, dated November 18, 1884.

Application filed April 7,.1E84. (No model.)

'I 0 all whom it may concern..-

Be itknown that I, G. ARTHUR WAsHBURN, of Plainville, in the county of Hartford and State of Connecticut, have invented a certain new and useful Improvement in Snap-Hooks, of which the following is a description, reference being had to the accompanying drawings, where Figure 1 is aside view ofthe complete device. Fig. 2 is a top view of the same. Fig. 3 is a view of the same in central vertical longitudinal section. Fig. 4 is a cross-section of the same through the laterally-moving lockingpin. Fig. 5 is a view of a screwdriver made use of.

The letter a denotes the body of the hook. 7) denotes the tongue pivoted in the hoolebody There is a recess, a, in the hook-body rearward of the tongue, which holds the sliding block (I and the spring 6. The recess 0 is closed ontop by the hook-body, with the exception of a slot or mortise, f, for the travel of the thumb-piece, which is fast to the sliding block (I. The sliding block (1 has a wedge'shaped face co-operating with the projection b, which is apart of the tongue I). When the tongue is closed and this sliding block is pressed forward by the spring 6, any effort to depress and open the tongue simply by pressure applied to the tongue will simply force the projection 1) against the wedge-shaped face of the sliding block, preventing the tongue from being opened or depressed. Other sliding blocks have been used for locking a pivoted tongue in its closed position; but the feature in this regard in which my improvement consists is the use of a wedge shape or inclined plane for this purpose, it having great practical advantages for such purpose. The sliding block is moved backward by the users thumb applied to the thumb-piece a. which runs down through the slot f, and is fast to the sliding block. The spiral spring a presses the sliding block forward when permitted so to do. The sliding block further co-operates with the pivoted tongue by means of the teat h and Inortise i,

is closed and the user desires to lock it in that position by a lock additional to that afforded by the wedge-shaped sliding block, he applies the key Z to the screw-pin k and moves it outward till it engages with the orifice Obviously the whole device is locked until the screw-driver is again applied and the screwpin moved inward.

I claim as my improvement 1. In combination. in a snap-hook, the pivoted tongue I), provided with the projection I), and the wedge-faced sliding block d, substantially as described, and for the purpose set forth.

2. In combination, in a snap-hool ,tl1ehookbody (1, provided with the orifice j, the pivoted tongue b, provided with the projection b, the sliding block d, and the laterally-movable pin k, all substantially as described, and for the purpose set forth.

3. In combination, in a snap-hook, the pivoted tongue I), provided with the projection b and the teat h, and the wedge-faced sliding block (2, having the mortise 2', all substantially as described, and for the purpose set forth.

4. In combination,in asnap-hoolethehookbody (1, containing and partly covering the recess 0, the spring 6, the sliding wedge-faced block d, having the mortise 2', thumb-piece g, and the pivoted tongue I), provided with the projection b and the'teat h, all substantially as described, and for the purpose set forth.

G. ARTHUR WASHBURN.

Witnesses:

LOUIS BELMER, HARRY P. OHAPIN. 

